CLEANUP: assorted typo fixes in the code and comments

This is 7th iteration of typo fixes
diff --git a/src/stick_table.c b/src/stick_table.c
index 665cc37..72b0f8b 100644
--- a/src/stick_table.c
+++ b/src/stick_table.c
@@ -703,7 +703,7 @@
  * <nid> is the stick-table name which is sent over the network. It must be equal
  * to <id> if this stick-table is parsed from a proxy section, and prefixed by <peers>
  * "peers" section name followed by a '/' character if parsed from a "peers" section.
- * This is the responsability of the caller to check this.
+ * This is the responsibility of the caller to check this.
  * Return an error status with ERR_* flags set if required, 0 if no error was encountered.
  */
 int parse_stick_table(const char *file, int linenum, char **args,